#include <iostream>
#include <unistd.h>
#include <cstring>
#include <string>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "err.hpp"

using namespace std;

static void usage(string proc){
    cout << "Usage:\t\n" << proc << " serverIP serverPort\n" << endl;
}

int main(int argc, char* argv[]){
    if(argc != 3){
        usage(argv[0]);
        exit(USAGE_ERR);
    }

    string serverIp = argv[1];
    uint16_t serverPort = stoi(argv[2]);

    //1.create socket
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if(sock < 0){
        cerr << "socket error: " << strerror(errno) << endl;
        exit(SOCKET_ERR);
    }

    //2.connect
    struct sockaddr_in server;
    memset(&server, 0, sizeof(server));
    server.sin_port = htons(serverPort);
    server.sin_family = AF_INET;
    inet_aton(serverIp.c_str(),&(server.sin_addr));

    int cnt = 5;
    while(connect(sock, (struct sockaddr*)&server, sizeof(server)) != 0){
        cout << "reconnect, left: " << cnt-- << endl;
        if(cnt <= 0)
            break;
    }
    if(cnt <= 0){
        cerr << "connect fail" << endl;
        exit(CONNECT_ERR);
    }

    char buffer[1024];
    while(true){
        string line;
        cout << "Enter>>> ";
        getline(cin, line);

        write(sock, line.c_str(), line.size());

        ssize_t s = read(sock, buffer, sizeof(buffer)-1);
        if(s > 0){
            buffer[s] = 0;
            cout << "server echo>>> " << buffer << endl;
        }
        else if(s == 0){
            cerr << "server quit" << endl;
            break;
        }
        else{
            cerr << "read error: " << strerror(errno) << endl;
            break;
        }
    }
    close(sock);

    return 0;
}